All Hanna Euli wants is to become a proper witch - but unfortunately, she's stuck as an apprentice to a grumpy fisherman. When their boat gets caught up in a mysterious storm and blown wildly off course, Hanna finds herself further away from home than she's ever been before. As she tries to get back, she learns there may be more to her apprentice master than she realized, especially when a mysterious, beautiful, and very non-human boy begins following her through the ocean, claiming that he needs Hanna's help.